Vibrational spectra of double oxalates of the type MI2Cu(C2O4)2·2H2O (MI = Na+, K+, NH4+)

The infrared and Raman spectra of Na2Cu(C2O4)2·2H2O, K2Cu(C2O4)2·2H2O and (NH4)2Cu(C2O4)2·2H2O were recorded and briefly discussed on the basis of their structural peculiarities and by comparison with the vibrational spectra of other metallic oxalates.

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► Double oxalates of the type MICu(C2O4)2·2H2O (MI = Na+, K+, NH4+) were investigated.
► IR and Raman spectra could be interpreted on the basis of the known structures.
► Small structural differences between these compounds were spectroscopically detected.